Coolant Reserve Overfilling

ASSISTANCE Stock Engine-Bay Components
1

Hello,

I recently put some antifreeze in my car this morning, and when I checked my overflow reserve tonight, it was overfull. How does this happen? Thank you.

2

probably the rad cap. it’s a 2 way valve, allowing coolant into the overflow, then pulling from it

3

Thanks a bunch Welfare!

4

Do you have a stock rad or full aluminum, also what cap you running? Stock or aftermarket.